The National Environment Agency on Monday issued a heavy rain warning, with moderate to heavy thundery showers with gusty wind expected over northern, western and central areas of Singapore between 8.30am and 9.20am.

PUB says flash floods may occur in the event of heavy rain.

For flash floods updates, visit PUB Facebook: http://www.facebook.com/PUBSg or PUB Twitter: http://twitter.com/PUBSingapore.